Armature for dynamo-electric machines and motors



(No Model.)

J. BEATTIE, Jr.. ARMATURE FOR DYNAMO ELECTRIC MACHINES ANDMOTORS. No.459,923.

Patente (1 Sept. 22, 1 8 91. rag, J

M M WMUHIJNMMNS INVEA/[OR (707m Beaffzc 3r %SZZWM O ATTORNEY.

UNITED STATES PATENT OEEICE.

JOHN BEAT"IE, JR, OF FALL RIVER, MASSACIIUSETTS.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES AND MOTORS.

SPECIFICATION forming part of Letters Patent No. 459,923, datedSeptember 22, 1891. Application filed December 9, 1890. Serial No.374,006. (No model.)

To all whom it may concern:

Be it known that I, JOHN BEATTIE, J r., a citizen of the United States,residing at Fall River, county of Bristol, State of Massachusetts, haveinvented certain new and useful Improvements in Armatures for Dynamo-Electric Machines and Motors, of which the following is a specification.

My invention relates to dynamo -electric machinery, and has particularreference to the construction of the armatures of the same.

The object of the invention is to improve the construction of what isknown as the Pacinotti type of armature. This armature consistsof aringor cylinder having deep grooves in its periphery parallel to its axis,which formprojections or teeth in the core of the armature. The coils orconductors are deposited in the grooves. The surface or periphery of thearmature is therefore made up of alternate longitudinal rows of iron andconductors,which necessarily render the surface moreor less uneven andnecessitates a considerable air-space between the armature and thepole-pieces of the machine, besides causing humming when the armature isin motion. It has been proposed to obviate this objection by coveringthe surface or periphery of the armature with sheet-iron. This overcomesthe objections noted above, but introduces a new one-to wit, thesheet-iron becomes hot and buckles, besides injuring the insulation ofthe conductors.

My invention consists in substituting for the sheet-iron covera layer ofbare iron wire wound spirally upon the surface of the armature from endto end with the convolutions slightly separated from one another, andinsulating material consisting, preferably, of a textile cord woundbetween them. This covering, when wound closely, furnishes a smoothsurface containing a sufficient iron to conduct the lines of force andsufficiently broken up to prevent undue heating.

Referring to the accompanying drawings, Figure 1 represents a side viewof an armature constructed according to my invention. Fig. 2 is atransverse section of the same; and Fig. 3 is an enlarged detail of aportion of the surface of the armature, showing how the covering islaid.

Referring to the drawings by letter, A represents the core of anarmature. It may be either a Gramme ring or a Siemens armature; but itis provided with grooves a of more or less depth, which run across theperiphery parallel to its axis. The core A may be of solid iron, orpreferably, as usually constructed, of thin iron plates with sheets ofinsulating material between them.

1) represents the electric conductors, consisting, usually, of insulatedcopper wire, which entirely fill the grooves a.

0 represents the serving of bare iron wire, which is wound around theperiphery of the armature from end to end, a small space being leftbetween the convolutions for a serving of insulating material (Z, suchas twine or a specially-prepared material.

I do not confine myself to any particular way of winding the wire ortheinsulatingmaterial, as the same may be put on separately orsimultaneously and by any method desired.

As before stated, theiron wire is bare, and it is placed in directcontact with the iron projections of the armature-core and forms inreality a part or extension of said core. This layer of wire andinsulating material presents an even surface, permitting of very closerunning to the polepieces, and from the fact that the iron is separatedthe heating thereof will be reduced to the minimum. Humming of thearmature also will be prevented. Of course all the advantages of closerunning to the pole-pieces are secured by this invention-that is, slowspeed and few ampere-turns on the field-magnet.

If desired, the iron wire may be a series of wire rings sweated onto thearmature and alternating with rings of insulating material. The wirewill at any rate be wound upon the armature under tension and will actas a binding agent to hold the conductorsin place.

Having thus described my invention, 1 claim- An armature for d ynamo-electric machines or motors, consisting of an iron core havinggrooves in its periphery parallel to the axis of the armature and inwhich the armatureconductors are deposited, in combination with ironwire and insulating material wound or placed upon the surface of thearmaturent In Witness whereof I have signed my name substantially rightangles with the arinatnrein the presence of two subscribing Witnesses.conductors, the convolutions 01 turns of the iron wire alternating withthe eonvolutions JOHN BEA'PTIE, JR. 5 01' turns of the insulatingmaterial, substan- \Vitnesses:

tially as described, and for the purpose set ANDREW J. JENNINGS,

forth. 1

ARTHUR S. PHILLIPS.

